"Scientific American Frontiers” host (4)

I believe the answer is:

alda

'scientific american frontiers host' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for alda that I've seen before include "American actor" , "Alan ---, M.A.S.H. actor" .)

I've seen this clue in The Wall Street Journal.

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